Underground Construction - September 2020 - 26

How to Build a Customized Excavation Protective System
per square foot (psf) is typical for a
commercial building load. In the shoring
industry, when working underground
with dirt, it can be in the 1,000 psf range
without any surcharges.

If there are additional surcharge loads
nearby, such as roadways, waterways,
buildings or railroads, it can be in the 2,000
to 3000 psf range, depending on the depth.
It becomes a different economy of scale.

Completing 3D shoring designs
When it comes to drawings, it makes sense
for the solution provider to use a graphics
communication package that enables
drafters to design in 3D. This approach
allows contractors to have a clear picture
of what the shoring system will look like.
They also have a much better idea of how
to comply after looking at 3D shoring
designs, rather than 2D plans.
Once the formal drawings are complete,
the P.E.s will seal and certify the entire
shoring design package, which includes
the drawn plans and the supporting
calculations.
One thing to keep in mind: it can
be a real advantage to work with a
third-party engineering department
that also performs design services for
other lines of business offering support
to the construction project.
For example, almost always, contractors
not only need to support the excavation
structurally, but also need to dry out the
excavation so they can do their work.
If the solution provider also has fluid
solutions engineers who can assist with
the groundwater control portion of the
design, the dewatering plans can be
included in the sealed design package.

Addressing regulatory hurdles
For public works projects, like
infrastructure installation or repair,
the P.E.-sealed plans must be sent to
regulatory reviewers, who may require
changes. For excavation projects, there
are no universal codes like there are on
the building side, so best practice is to
consult with the appropriate experts.
On the shoring side, it really depends
who you are submitting to - municipality,
department of transportation, or even
an engineering firm that was hired by the
owner. They are all looking for different
things, so there's a lot of back and forth
on submittals. Be sure your solution
provider's engineering team is experienced
in doing whatever it takes to get the
shoring plans approved and back to the
contractor as quickly as possible. *
JOSH CHANDLER, P.E., leads United
Rentals' Engineering Department staff. Chandler is
registered as a Professional Engineer in 48 states,
as well as in five bordering Canadian provinces.

26

SEPTEMBER 2020 | UCONonline.com


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Underground Construction - September 2020

Table of Contents for the Digital Edition of Underground Construction - September 2020

Contents
Underground Construction - September 2020 - FC
Underground Construction - September 2020 - IFC
Underground Construction - September 2020 - Contents
Underground Construction - September 2020 - 4
Underground Construction - September 2020 - 5
Underground Construction - September 2020 - 6
Underground Construction - September 2020 - 7
Underground Construction - September 2020 - 8
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Underground Construction - September 2020 - IBC
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